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W. H. TAYLOR.

LOCK.

No. 373,107. Patented Nov. 15, 11887.

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,To thwart this method of attacking ordinary UNITED STATES PATENT OFFICE.

WARREN H. TAYLOR, OF STAMFORD, CONNECTICUT, ASSIGNOR TO THE YALE 8U TOWN EV MANUFACTURING COMPANY, OF SAME PLACE.

LOCK.

' SPECIFICATION forming part of Letters Patent No. 373,107, dated November 15l 1887.

Application tiled September 26. 1887. Serial No. 250.755. (Novmodel.)

To all whom it may concern: l Be it known that I, WARREN H. TAYLOR, of Stamford, in the county of Fairfield and State of Connecticut, have invented a certain new and useful Improvement in Locks, of which the following is a specification, reference being had to the accompanying drawings. A l

The object of my invention is to prevent the unscrewing of the set-screw ordinarily used to fix an escutcheou iu place in a lock, and thus to prevent the escutcheon from being unscrew-ed and removed.

In ordinary locks the escutcheou is screwed in place and a set-screw is set into agroove in the side of the escu'tcheon to tix it in the lockease, so that it cannot be turned. When a door is unlocked, however, amisehievous person might slightly unscrew the set-screw, and afterward,when the door is locked, might unscrew the escutcheon and get ac cess to the in terior of the lock, and thus unlock the door.

door-locks@ provide means ordinarily sufl cient to prevent the set-screw from being turned when the lock is unlocked.

In the accompanying drawings, illustrating my invention, Figure I is a View of the lock with the cap-plate removed, so as to show the interior of the lock, and Fig.l 2 is an edge view of the lock partly broken away.

Referring to the letters upon the drawings, A indicates the lock-case, B a lock-bolt, and C a screw-threaded escutcheon set into the case in the usual way.

D indicates a set-screw, and E a forked slide adapted to enter the grooves in two opposite escutcheons and hold them in place.

may be secured in place by means of screws,

as shown, or by means of rivets, or in any usual Way, so that it would not ordinarily .be practicable fora mischievous person to remove the plate and unscrew the set-screw without being observed. Where this guardplate is used the set-screw should not be counl tersunk, as is usual, but should be made Hush, so as to project and be observed if loosened, and so that the guard-plate could not be put in place unless the set-screw were screwed in so as to hold the escutcheon.

What I claimto be new, and desire to secure by Letters Patent of the United States, is-

In a lock, the combination, with an escutchecn-securing set-screw, of a guard-plate covering the head of the set-screw and secured to the face-plate ofthe lock, substantially as set forth.

In testimony whereof I have hereunto subscribed my name.

WARREN H. TAYLOR.

Witnesses:

SCHUYLER MERRITT, GEO. E. WHITE. 

